Jon
I have been enjoying this exchange of information.
The frequency range of local earthquakes in Iceland is typical of the=20
frequency range of small earthquakes recorded on rock near to the=20
source. You just have to sample at a high rate 100 or preferably 200s/s=20=

to see it. For monitoring of mining rock bursts up close you have to=20
increase this rate by a factor of 10 or more.
In the Lachlan Foldbelt in southeastern Australia we typically record=20
ground shaking near 50 Hz for small earthquakes up to ML 4 and there=20
isn't  a recently active volcano for 500 km or so.
Regards
Kevin

On 24/01/2006, at 1:11 PM, J=F3n Fr=EDmann wrote:

> Hi Geoff and others.
>
> I am not the Freeman of the game Half Life, hoever few guys in my old
> school did call me that becose they did figure that i did look like=20
> that
> game caracter. :-)
>
> The problem with earthquakes here in Iceland is this, they are mostly=20=

> in
> the range of 2 - 60Hz and problay higer. Since many of them are of
> volcanic nature.
>
> I am directly above bedrock, it is about 1 to 2 meters at the most =
down
> to it.
>
> Bye
> --=20
> J=F3n Fr=EDmann J=F3nsson
> http://www.jonfr.com
>
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>
Kevin McCue
Director
Australian Seismological Centre
PO Box 324 Jamison Centre
ACT 2614
Australia
ph: 61 (0)2 6251 1291

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